Hi Mort!
Update: I finally had the chance to fit the extra lights, and I had no problems. I fitted them using the standard procedure for fitting extra lights and they work with main beam and also when I flash the lights.
The lights are Hella's 17,5 ref full/main beam auxiliary lights, so they're legal here and in Norway. The blue and the shape was a coincidence (these were left over from a previous car), but I think they look ok!
I fitted them behind the number plate using a standard black plate with mounting ears on it. You probably have them in Norway - Biltema sell them in other Scandinavian countries anyway (I looked for it for you:
http://www.biltema.no/no/Sok1/Alle/?quicksearchquery=42490). I bolted mine on with three bolts, if I remember right. I drilled through the bumper plastic and fitted right length bolts with big washers so they don't rip through the plastic bumper. It was difficult but possible to get the bolt up behind the bumper, with the washer in place, and push it through. A spanner can fit in there to hold it when you are tightening nuts from the front.
Wiring: I wired using a 4 pin relay and thick enough wire using the normal accessory wiring. The four pins were:
- feed direct from the battery (via an inline fuse) to the relay
- earth
- switching signal
- feed to lights
The switching signal I jumped from behind the right-hand headlight (passenger side for you, Mort). From memory, I think it was a purple kind of colour, but check it first. (I wired the signal from the low beam to turn off the DRLs at the same time, and also located the front fog to make sure they went right, so double check! But I *think* it was purple main beam, orangey-colour for low beam and red for fogs. But check using a live tester with a spike!) NOTE: I don't recommend using a suitcase connector, piggyback connector or whatever they're called, which are the blue things that go over the existing wire and crush a new one in next to it. The guy whose garage I was in jokingly said that their use is banned in his garage, and I found out why. I used them, as it was all I had, and they connection was rubbish. Sometimes on, sometimes off... I took the suitcases out and chopped the wires (for these and the DRLs) and replaced with a sleeve connector. The live from the battery should be fused and thick enough to take the current of whatever lights you put on there. Same goes for the feed to the lights. The relay earth doesn't have to be anything special, as I understand it, but it doesn't harm if it is thick, too. The signal from the main beam to the relay can be pretty much anything, as it doesn't carry much current.
Finally, after the relay is on and wired up, you of course need to earth the lights themselves. In my experience (I've fitted a few sets of these in my time) this is the area that causes most problems as it doesn't get done well. Simply earthing 'somewhere' might not be good enough! I ran earth cables that were as thick as the live feeds from each light back to the battery earth. As I was running wires along that route anyway it wasn't too much extra effort, and it guarantees a good earth.
Wiring colours: For clarity and to help future owners of your car (or mechanics), think about what colour wires you use. Not all the same colour and thickness because you happen to have a big reel of cable in the garage! (I've seen it done... a nightmare to try and trace wires later on!) I don't know if there is an official recommended colour system, but I use the following where possible: Red is live from the battery, yellow is switched live to the lights or other accessory, blue (if possible) for full beam signal to the relay (like it used to be in old cars) and always black for earth cables. Tbh, in reality my feed to the relay is red, because I happen to have a reel of red cable bought years ago for running marker lights on lorries and it doesn't need to be any thincker than that!